Hard-shell battery

Abstract

The invention discloses a hard-shell battery. The hard-shell battery comprises a shell, a battery cell, a first pole and a second pole, the shell has an accommodating cavity; the battery cell is positioned in the accommodating cavity and comprises a first pole piece, a second pole piece and an isolating membrane positioned between the first pole piece and the second pole piece; the first pole is insulated from the shell, and the first pole penetrates through the side wall, corresponding to the thickness direction of the first pole piece, of the shell and is connected to the first pole piece; the second pole column is connected to any side wall of the shell, and the surface of the second pole piece in the thickness direction is connected to the shell, or the second pole column is arranged on the side wall, corresponding to the thickness direction of the second pole piece, of the shell in a penetrating mode, and the second pole column is connected to the second pole piece. A gap for accommodating the tabs does not need to be formed between the battery cell and the shell, so that the energy density of the hard-shell battery disclosed by the embodiment of the invention is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly relates to a hard-shell battery. Background Art

[0002] In related technologies, for hard-shell batteries, such as steel-shell batteries or aluminum-shell batteries, etc., in order to avoid battery short circuit, at least one of the internal positive and negative electrode plates needs to be insulated from the outer shell. That is to say, at least one pole post needs to penetrate through the outer shell in an insulated manner and be connected to an internal electrode plate. Currently, the pole post is usually arranged on one side of the head of the battery cell, that is, on the side corresponding to the narrow surface of the internal electrode plate. In order to ensure that the pole post and the battery cell have sufficient connection area, an electrode tab needs to be welded on the battery cell, and the electrode tab is bent so that the surface in the thickness direction of the electrode tab itself is connected to the pole post. Therefore, enough space needs to be left between the battery cell and the housing to accommodate the bent electrode tab, resulting in a decrease in the energy density of the battery. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a hard-shell battery cell that can have a higher energy density.

[0004] The hard-shell battery according to an embodiment of the present invention includes an outer shell, a battery cell, a first pole post, and a second pole post.

[0005] The outer shell has a receiving cavity; the battery cell is located in the receiving cavity, and the battery cell includes a first electrode plate, a second electrode plate, and a separator located between the first electrode plate and the second electrode plate; the first pole post is insulated from the outer shell, the first pole post penetrates through the side wall of the outer shell corresponding to the thickness direction of the first electrode plate, and the surface in the thickness direction of the first electrode plate itself is connected to the first pole post; the second pole post is connected to any side wall of the outer shell, and the surface in the thickness direction of the second electrode plate itself is connected to the outer shell, or the second pole post penetrates through the side wall of the outer shell corresponding to the thickness direction of the second electrode plate, and the surface in the thickness direction of the second electrode plate itself is connected to the second pole post.

[0006] The hard-shell battery according to an embodiment of the present invention has at least the following beneficial effects:

[0007] In the present invention, the first pole column is located on the side wall of the outer shell corresponding to one side of the first pole piece in the thickness direction, and is connected to the surface of the first pole piece in its own thickness direction, so that there is a sufficient connection area between the first pole piece and the first pole column, and there is no need to provide a pole ear, thus there is no need to reserve a gap between the battery cell and the outer shell for accommodating the pole ear connecting the first pole piece and the first pole column. At the same time, one side of the second pole piece in the thickness direction is connected to the outer shell or connected to the second pole column. Therefore, there is also no need to set a gap between the battery cell and the outer shell for accommodating the pole ear connecting the second pole piece and the second pole column. Thus, compared with the prior art, there is no need to set a gap for accommodating the pole ear between the battery cell and the outer shell in this solution, thereby improving the energy density of the hard shell battery in this embodiment.

[0008] According to some embodiments of the present invention, the first pole piece includes multiple first flat portions distributed in a first direction, and each of the first flat portions is electrically connected to each other. The second pole piece includes multiple second flat portions distributed in the first direction, and each of the second flat portions is electrically connected to each other. In the first direction, the first flat portions and the second flat portions are alternately distributed. Among the two outermost first flat portions in the multiple first flat portions, the first flat portion closer to the first pole column is connected to the first pole column.

[0009] According to some embodiments of the present invention, the first pole column and / or the second pole column is located outside the battery cell.

[0010] According to some embodiments of the present invention, the separator includes multiple third flat portions distributed in the first direction. Each layer of the third flat portions has a first connection hole, and each layer of the second flat portions has a second connection hole. In the first direction, the first connection holes of every two adjacent layers of the third flat portions and the second connection holes of the second flat portions located between two adjacent layers of the third flat portions at least partially overlap to form a first electrical connection hole, so that adjacent first flat portions are connected to each other through the first electrical connection hole.

[0011] According to some embodiments of the present invention, the first flat portion defines a first mounting hole located inside the battery cell at a position corresponding to the first electrical connection hole, and a part of the first pole column is inserted into the first mounting hole.

[0012] According to some embodiments of the present invention, each layer of the first flat portions has a third connection hole at a position corresponding to the first electrical connection hole. The third connection hole, the second connection hole, and the first connection hole together form a first mounting hole that penetrates the battery cell in the first direction;

[0013] The first pole column includes a first main body portion and a first flange portion. The first flange portion is connected to the first main body portion and protrudes from the radial side surface of the first main body portion. The first main body portion is inserted into the first mounting hole. The edges of the third connection holes of the multiple first flat portions are bent toward the first flange portion and are all connected to the side surface of the first flange portion in the first direction.

[0014] Alternatively, the edge of each third connection hole further includes a first flanging portion that is folded along the first direction, and the first flanging portion is connected to the radial side surface of the first pole column.

[0015] According to some embodiments of the present invention, the first pole column includes a first main body portion and a first flange portion. The first flange portion is connected to the first main body portion and protrudes from the radial side surface of the first main body portion. The first main body portion is inserted into the first mounting hole. The edges of the third connection holes of the multiple first flat portions are bent toward the first flange portion and are all connected to the side surface of the first flange portion in the first direction.

[0016] The first flange portion is located inside the first mounting hole; or,

[0017] The first flange portion is located outside the first mounting hole.

[0018] According to some embodiments of the present invention, the first flange portion is located outside the first mounting hole, and the housing further has a first clearance groove that faces the accommodation cavity, and the first flange portion is located in the first clearance groove.

[0019] According to some embodiments of the present invention, in the first direction, the housing has first side walls that are oppositely arranged. The first side walls have the first clearance grooves, and the first clearance grooves penetrate through the first side walls.

[0020] The first pole column further includes a first connection portion. The first main body portion has a second mounting hole that penetrates along the first direction. The first connection portion passes through the second mounting hole and jointly forms a riveting structure with the first main body portion to fix the first pole column to the housing.

[0021] According to some embodiments of the present invention, each layer of the third flat portions further has fourth connection holes, and each layer of the first flat portions all has fifth connection holes. In the first direction, the fourth connection holes of every two adjacent layers of the third flat portions and the fifth connection holes of the first flat portions located between two adjacent layers of the third flat portions at least partially overlap to form second electrical connection holes, so that the adjacent second flat portions are connected to each other through the second electrical connection holes.

[0022] According to some embodiments of the present invention, the second flat portion defines a third mounting hole inside the battery cell at a position corresponding to the second electrical connection hole, and a part of the second pole is inserted into the third mounting hole.

[0023] According to some embodiments of the present invention, at the position of each layer of the second flat portion corresponding to the second electrical connection hole, there is a sixth connection hole, and the fourth connection hole, the fifth connection hole, and the sixth connection hole together form a third mounting hole that penetrates the battery cell along the first direction;

[0024] The second pole includes a second main body portion and a second flange portion. The second flange portion is connected to the second main body portion and protrudes from the radial side surface of the second main body portion. The second main body portion is inserted into the third mounting hole. The edges of the fourth connection holes of multiple layers of the second flat portion are bent toward the second flange portion and are all connected to the side surface of the second flange portion in the first direction; or,

[0025] The edge of each of the fourth connection holes further includes a second flanging portion that is turned over along the first direction, and the second flanging portion is connected to the radial side surface of the first pole.

[0026] According to some embodiments of the present invention, the second pole includes a second main body portion and a second flange portion. The second flange portion is connected to the second main body portion and protrudes from the radial side surface of the second main body portion. The second main body portion is inserted into the third mounting hole. The edges of the fourth connection holes of multiple layers of the second flat portion are bent toward the second flange portion and are all connected to the side surface of the second flange portion in the first direction;

[0027] The second flange portion is located inside the third mounting hole; or,

[0028] The second flange portion is located outside the third mounting hole.

[0029] According to some embodiments of the present invention, the second flange portion is located outside the third mounting hole, and the outer shell further has a second clearance groove facing the accommodating cavity, and the second flange portion is located in the second clearance groove.

[0030] According to some embodiments of the present invention, the second flange portion is welded to the inner wall of the second clearance groove to form an integral structure with the outer shell.

[0031] According to some embodiments of the present invention, the radial side surface of the second flange portion is hermetically welded to the inner wall of the second clearance groove.

[0032] According to some embodiments of the present invention, in the first direction, the housing has first side walls disposed opposite to each other, the first side walls have the second clearance grooves, and the second clearance grooves penetrate through the first side walls;

[0033] The second pole also includes a second connecting portion. The second main body portion has a fourth mounting hole penetrating along the first direction. The second connecting portion is inserted through the fourth mounting hole and together with the second main body portion forms a riveting structure to fix the second pole to the housing.

[0034] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below in conjunction with the drawings and embodiments, where:

[0036] Figure 1 is a schematic structural view of a hard-shell battery according to the first embodiment of the present invention;

[0037] Figure 2 is Figure 1 a cross-sectional view of;

[0038] Figure 3 is a cross-sectional view of a hard-shell battery according to the second embodiment of the present invention;

[0039] Figure 4 is a cross-sectional view of a hard-shell battery according to the third embodiment of the present invention;

[0040] Figure 5 is a cross-sectional view of a hard-shell battery according to the fourth embodiment of the present invention;

[0041] Figure 6 is Figure 5 an enlarged view of area A in;

[0042] Figure 7 is a cross-sectional view of a hard-shell battery according to the fourth embodiment of the present invention;

[0043] Figure 8 is Figure 7 an enlarged view of area B in;

[0044] Figure 9 is a cross-sectional view of a hard-shell battery according to the fifth embodiment of the present invention;

[0045] Figure 10 is Figure 9 an enlarged view of area C in;

[0046] Figure 11 is a cross-sectional view of a hard-shell battery according to the sixth embodiment of the present invention;

[0047] Figure 12 is Figure 11 An enlarged view of region D in

[0048] Figure 13 A cross-sectional view of the hard shell battery according to the seventh embodiment of the present invention;

[0049] Figure 14 is Figure 13 An enlarged view of region E in

[0050] Figure 15 A cross-sectional view of the hard shell battery according to the eighth embodiment of the present invention;

[0051] Figure 16 is Figure 15 An enlarged view of region F in

[0052] Reference numerals:

[0053] Outer shell 100, accommodation cavity 110, first side wall 120, first clearance groove 121, second clearance groove 122, third clearance groove 123, fourth clearance groove 124, second side wall 130;

[0054] First pole column 200, first main body portion 210, second mounting hole 211, first flange portion 220, first connecting portion 230, first locking portion 231, second locking portion 232;

[0055] Second pole column 300, second main body portion 310, fourth mounting hole 311, second flange portion 320, second connecting portion 330, third locking portion 331, fourth locking portion 332;

[0056] Electric core 400, first pole piece 410, first flat portion 411, stacked sheet 401, first bending portion 412, third connecting hole 413, fifth connecting hole 414, first flanging portion 415, second pole piece 420, second flat portion 421, second connecting hole 422, sixth connecting hole 423, separator film 430, third flat portion 431, first connecting hole 432, fourth connecting hole 433, first electrical connection hole 440, first mounting hole 450, second electrical connection hole 460, third mounting hole 470;

[0057] Insulating member 500. Detailed implementation manners

[0058] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described by referring to the drawings below are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0059] In the description of the present invention, it should be understood that regarding the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0060] In the description of the present invention, the meaning of "several" is more than one, the meaning of "multiple" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the recited number, while understandings such as "above", "below", "within", etc. include the recited number. If there is a description of "first", "second", etc., it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0061] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0062] In the description of the present invention, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0063] In the related art, for hard-shell batteries, such as steel-shell batteries or aluminum-shell batteries, etc., in order to avoid battery short-circuit, at least one of the internal positive and negative electrode plates needs to be insulated from the outer shell, which means that at least one pole column needs to pass through the outer shell in an insulated manner and be connected to an internal electrode plate. Currently, the pole column is usually arranged on one side of the head of the battery cell, corresponding to the side of the narrow surface of the internal electrode plate. In order to ensure that the pole column and the battery cell have sufficient connection area, it is necessary to weld a tab on the battery cell and bend the tab so that the surface in the thickness direction of the tab is connected to the pole column. Therefore, enough clearance needs to be left between the battery cell and the housing to accommodate the bent tab, resulting in a reduction in the energy density of the battery.

[0064] In view of the above background, the present invention proposes a hard-shell battery (for the convenience of description, hereinafter referred to as the battery unless otherwise specified), which can have a higher energy density. The present invention takes a square steel-shell battery as an example for illustration, but is not limited thereto. Refer to Figures 1 to 4 ,Figure 1 This is a schematic structural diagram of a hard-shell battery according to the first embodiment of the present invention. Figure 2 It is Figure 1 a cross-sectional view of Figure 3 This is a cross-sectional view of the hard-shell battery according to the second embodiment of the present invention. Figure 4 This is a cross-sectional view of the hard-shell battery according to the third embodiment of the present invention. The hard-shell battery of this embodiment includes a housing 100, a battery cell 400, a first terminal 200, and a second terminal 300.

[0065] Among them, the housing 100 is, for example, a rigid housing 100 such as an aluminum shell, a steel shell, or a composite metal shell. The housing 100 has a receiving cavity 110. The battery cell 400 is, for example, a stacked battery cell or a wound battery cell. The battery cell 400 is located in the receiving cavity 110. The battery cell 400 includes a first electrode plate 410, a second electrode plate 420, and a separator 430 located between the first electrode plate 410 and the second electrode plate 420. The first electrode plate 410 is, for example, a cathode plate, and the second electrode plate 420 is an anode plate. Alternatively, the first electrode plate 410 is an anode plate, and the second electrode plate 420 is a cathode plate.

[0066] Regarding the first terminal 200, the first terminal 200 is insulated from the housing 100. The first terminal 200 passes through the side wall of the housing 100 corresponding to the thickness direction of the first electrode plate 410 and is connected to the surface of the first electrode plate 410 in the thickness direction. For example, the housing 100 has a through hole. The first terminal 200 passes through the through hole, and an insulating member 500 is sleeved outside the first terminal 200 to insulate the first terminal 200 from the housing 100. Taking a square steel shell battery as an example, the battery has a set thickness, a set length, and a set width. In the thickness direction of the battery, in the prior art, the terminal is provided on one side in the length direction of the battery, while in this embodiment, the first terminal 200 is located on one side in the thickness direction of the first electrode plate 410, that is, the first terminal 200 is located on one side in the width direction or the thickness direction of the battery. Preferably, the first terminal 200 is located on one side in the thickness direction of the battery to increase the connection area between the first terminal 200 and the first electrode plate 410.

[0067] For example, in some embodiments, the first electrode plate 410 includes a plurality of first flat portions 411 distributed in a first direction (for example, the thickness direction in a square steel shell battery, the same hereinafter unless otherwise specified), and the first flat portions 411 are electrically connected to each other. As Figure 3 shown, taking a wound battery cell as an example, the first electrode plate 410 further includes first bending portions 412 located on both sides of the first flat portions 411, and the first flat portions 411 are electrically connected through the first bending portions 412. As Figure 4As shown, taking the laminated battery cell as an example, each laminate 401 of the first electrode tab 410 in the laminated battery cell is a first flat portion 411. Each first flat portion 411 can be electrically connected through a connecting member (connected by the first pole 200 in the following embodiments), or the first flat portion 411 is recessed at the first connection hole 432 so that each first flat portion 411 is in contact through the first connection hole 432 and the second connection hole 422 to achieve electrical connection. Among them, in the two outermost first flat portions 411 of the multiple layers of first flat portions 411, the first flat portion 411 closer to the first pole 200 is connected to the first pole 200 (it cannot be interpreted that only the outermost first flat portion 411 is connected to the first pole 200. In some embodiments, the inner first flat 411 are all connected to the first pole 200) to increase the area of the first electrode tab 410 connected to the first pole 200, so as to improve the charge and discharge efficiency of the battery and the stability of the connection. Moreover, the flat first flat portion 411 is easier to connect to the first pole 200, so that the battery processing of this embodiment is more convenient and the processing cost is reduced.

[0068] Regarding the second pole 300, when one side in the self-thickness direction of the second electrode tab 420 is connected to the housing 100, the second pole 300 is connected to any side wall of the housing 100. Specifically, the surface in the self-thickness direction of the second electrode tab 420 is directly connected to the housing 100 so that the housing 100 is charged (as Figure 2 shown). For example, when the second electrode tab 420 is an anode tab, the second electrode tab 420 is connected to the housing 100 so that the housing 100 is negatively charged. The second pole 300 is directly connected to the housing 100 and is electrically connected to the second electrode tab 420 through the conductivity of the housing 100, without necessarily being directly connected to the second electrode tab 420. Therefore, the second pole 300 can be disposed on any side wall of the housing 100, such as on the side wall in the length direction of the battery, the side wall in the width direction of the battery, or the side wall in the thickness direction of the battery. In addition, in some embodiments, the second pole 300 penetrates the side wall corresponding to the thickness direction of the second electrode tab 420 of the housing 100, and the second pole 300 is connected to the second electrode tab 420. The principle is similar to the connection between the first pole 200 and the second electrode tab 420, and will not be elaborated here.

[0069] Specifically, in the present invention, the first terminal 200 is located on a side wall of the outer casing 100 corresponding to one side of the first electrode tab 410 in the thickness direction, and is connected to a surface of the first electrode tab 410 in its own thickness direction, so that there is a sufficient connection area between the first electrode tab 410 and the first terminal 200, without the need to provide a tab, and thus there is no need to reserve a gap between the battery cell 400 and the outer casing 100 for accommodating the tab connecting the first electrode tab 410 and the first terminal 200. At the same time, one side of the second electrode tab 420 in the thickness direction is connected to the outer casing 100 or connected to the second terminal 300. Therefore, there is also no need to provide a gap between the battery cell 400 and the outer casing 100 for accommodating the tab connecting the second electrode tab 420 and the second terminal 300. Thus, compared with the prior art, there is no need to provide a gap for accommodating the tab between the battery cell 400 and the outer casing 100 in this solution, thereby improving the energy density of the hard-shell battery in this embodiment.

[0070] Refer to Figure 5 and Figure 6 , Figure 5 is a cross-sectional view of the hard-shell battery according to the fourth embodiment of the present invention. Figure 6 is Figure 5 an enlarged view of area A in

[0071] Specifically, each first flat portion 411 can be electrically connected through an additionally provided connection structure (such as the first pole 200 in the following embodiments). The connection structure is a conductive structure. The first flat portion 411 is provided with a third connection hole 413 at a position corresponding to the first electrical connection hole 440. The connection structure passes through the first connection hole 432, the second connection hole 422, and the third connection hole 413 and is connected to the first flat portion 411. There is a gap between the connection structure and the hole wall of the second connection hole 422 to prevent short circuit between the first pole piece 410 and the second pole piece 420. For example, the first connection hole 432, the second connection hole 422, and the third connection hole 413 are coaxially arranged, and the aperture of the second connection hole 422 is larger than that of the third connection hole 413. Thus, when the connection structure passes through the third connection hole 413, it can ensure that there is a gap between the connection structure and the hole wall of the second connection hole 422. Further, the aperture of the first connection hole 432 is smaller than that of the second connection hole 422, that is, the isolation film 430 extends beyond the hole wall of the second connection hole 422, further reducing the risk of contact between the connection structure and the hole wall of the second connection hole 422. Or, in some embodiments, the first flat portion 411 is stamped or bent at a position corresponding to the first electrical connection hole 440, and the first flat portions 411 of each layer gather at a position corresponding to the first electrical connection hole 440 for electrical connection.

[0072] It should be noted that the first connection hole 432 is arranged inside the battery cell 400. Thus, the space inside the accommodation cavity 110 occupied by the connection structure for connecting the first flat portions 411 to each other can be reduced, thereby improving the battery charge and discharge efficiency while ensuring that the battery has a higher energy density. Specifically, taking a square steel shell battery as an example, the dimensions of the accommodation cavity 110 inside the battery corresponding to the length direction, width direction, and thickness direction of the battery are L 1 、L 2 and L 3 . For example, the connection structure is arranged on one side corresponding to the length direction of the battery outside the battery cell 400. The dimension of the connection structure in the length direction of the battery is L 4 , the dimension corresponding to the width direction of the battery is L 5 , L 5 <L 2 . Then, when setting the bonding structure, a gap needs to be set between the battery cell 400 and the outer shell 100 to accommodate the connection structure, and this gap occupies the volume V 1 =L 2 ×L 3 ×L 4 . That is, the battery cell 400 needs to give up a volume of V 1 for setting the connection structure, thereby reducing the energy density of the battery. In this embodiment, the connection structure is arranged inside the battery cell 400, and the connection structure occupies a volume V 2 =L3 ×L 4 ×L 5 ,V 2 <V 5 Therefore, on the premise of the accommodation cavity 110 of the same size, arranging the connection structure inside the battery cell 400 in this embodiment can enable the battery cell 400 to have a larger volume, thereby ensuring the energy density of the battery.

[0073] Similarly, referring to Figure 15 and Figure 16 , Figure 15 is a cross-sectional view of the hard shell battery according to the eighth embodiment of the present invention, Figure 16 is Figure 15 the enlarged view of the F area in Figure 15 In some embodiments, each layer of the third flat part 431 further has a fourth connection hole 433, and each layer of the first flat part 411 has a fifth connection hole 414. In the first direction, the fourth connection holes 433 of every two adjacent layers of the third flat parts 431 and the fifth connection holes 414 of the first flat part 411 located between two adjacent layers of the third flat parts 431 at least partially overlap to form a second electrical connection hole 460, so that the adjacent second flat parts 421 are connected to each other through the second electrical connection hole 460, which will not be elaborated here.

[0074] Figures 2 to 4

[0075] Contrary to the above embodiments, referring to Figures 7 to 10 , Figure 7 is a cross-sectional view of the hard shell battery according to the fourth embodiment of the present invention, Figure 8 is Figure 7 the enlarged view of the B area in Figure 7 Figure 9 Figure 10 is Figure 9Enlarged view of region C. In some embodiments, the first flat portion 411 defines a first mounting hole 450 located inside the battery cell 400 at a position corresponding to the first electrical connection hole 440. A portion of the first pole 200 is inserted into the first mounting hole 450, that is, a portion of the first pole 200 extends into the battery cell 400. For example, in some embodiments, at positions corresponding to the first electrical connection hole 440 of each layer of the first flat portion 411, there are third connection holes 413. The first connection hole 432, the second connection hole 422, and the third connection hole 413 together form a first mounting hole 450 that penetrates the battery cell 400 in the first direction. To ensure that the side surface in the thickness direction of the first electrode plate 410 is connected to the first pole 200, in some embodiments, the first pole 200 includes a first main body portion 210 and a first flange portion 220. The first flange portion 220 is connected to the first main body portion 210 and protrudes from the radial side surface of the first main body portion 210. The first main body portion 210 is inserted into the first mounting hole 450. The hole edges of the third connection holes 413 of the multiple layers of the first flat portion 411 are bent toward the first flange portion 220 and are all connected to the side surface of the first flange portion 220 in the first direction (as Figure 8 shown), so as to ensure the connection area between the first pole 200 and the first electrode plate 410. Alternatively, in some embodiments, the hole edge of the third connection hole 413 further has a first flanging portion 415 that is turned over in the first direction, and the first flanging portion 415 is connected to the radial side surface of the first pole 200. It can be understood that the insertion of the first pole 200 into the first mounting hole 450 can play a certain positioning role for the battery cell 400, thereby reducing the risk of the battery cell 400 moving. Thus, the risks of the outer shell 100 cracking, the battery cell 400 deforming, or the electrolyte leaking caused by the rotation of the battery cell 400 can be reduced, thereby improving the performance of the battery.

[0076] Similarly, referring to Figure 15 and Figure 16, in some embodiments, the second flat portion 421 is defined with a third mounting hole 470 located inside the battery cell 400 at a position corresponding to the second electrical connection hole 460, and a part of the second pole 300 is inserted into the third mounting hole 470. For example, in some embodiments, a sixth connection hole 423 is provided at the position of each layer of the second flat portion 421 corresponding to the second electrical connection hole 460, and the fourth connection hole 433, the fifth connection hole 414, and the sixth connection hole 423 together form a third mounting hole 470 that penetrates the battery cell 400 in the first direction. In order to ensure that the side surface in the thickness direction of the second pole piece 420 is connected to the second pole 300, in some embodiments, the second pole 300 includes a second main body portion 310 and a second flange portion 320. The second flange portion 320 is connected to the second main body portion 310 and protrudes from the radial side surface of the second main body portion 310. The second main body portion 310 is inserted into the second mounting hole, and the hole edges of the sixth connection holes 423 of the multi-layer second flat portions 421 are bent toward the second flange portion 320 and are all connected to the side surface of the second flange portion 320 in the first upward direction to ensure the connection area between the second pole 300 and the second pole piece 420. Alternatively, in some embodiments, the hole edge of the sixth connection hole 423 further has a second flanging portion that is turned over in the first direction, and the second flanging portion is connected to the radial side surface of the second pole 300.

[0077] Based on the above embodiments, in some embodiments, the first flange portion 220 is located inside the first mounting hole 450. Therefore, the first flange portion 220 does not need to occupy the external space of the battery cell 400, thereby improving the energy density of the battery. Similarly, in some embodiments, the second flange portion 320 is located inside the third mounting hole 470. Different from the above embodiments, in some embodiments, the first flange portion 220 is located outside the first mounting hole 450, that is, the first flange portion 220 is located outside the battery cell 400. By welding the first flange portion 220 and the first pole piece 410 outside the battery cell 400, the welding process between the first flange portion 220 and the first pole piece 410 is made simpler, and at the same time, the high temperature generated during welding can be located outside the battery cell 400, reducing the influence of the high temperature on the battery cell 400 to improve the performance of the battery. Similarly, in some embodiments, the second flange portion 320 is located outside the third mounting hole 470, which will not be elaborated here.

[0078] Referring to Figure 11 and Figure 12 , Figure 11 is a cross-sectional view of the hard-shell battery according to the sixth embodiment of the present invention. Figure 12 is Figure 11An enlarged view of region D in the middle. In some embodiments, the outer shell 100 further has a first clearance groove 121. The first clearance groove 121 faces the accommodation cavity 110. The first flange portion 220 is located within the first clearance groove 121. Thus, the first flange portion 220 does not need to additionally occupy the space of the accommodation cavity 110, thereby improving the energy density of the battery. Further, in order to improve the outer shell 100 of the soft-pack battery, the first flange portion 220 and the side wall of the first clearance groove 121 are bonded by an insulating adhesive to connect the first flange portion 220 and the outer shell 100 into an integral structure, thereby improving the strength of the outer shell 100 at the position where the first clearance groove 121 is provided, improving the overall strength of the outer shell 100, and further reducing the risk of the outer shell 100 being damaged and leaking liquid. Among them, the insulating adhesive forms an insulating member 500 between the first pole column 200 and the outer shell 100 to prevent the battery from short-circuiting. Further, a seal is provided between the radial side surface of the first flange portion 220 and the inner wall of the first clearance groove 121. Thus, during use, even if the bottom wall of the outer shell 100 corresponding to the first clearance groove 121 is damaged, the accommodation cavity 110 can be sealed through the first flange portion 220 to prevent the battery from leaking liquid. Further, one end of the first pole column 200 has a first flange portion 220, and the other end extends outside the outer shell 100 for connection with an electrical device, that is, both ends of the first pole column 200 are connected to the side wall of the outer shell 100. For example, the outer shell 100 has a first side wall 120 and a second side wall 130 in the first direction. One end of the first pole column 200 is connected to the first side wall 120, and the other end is connected to the second side wall 130. Therefore, when the battery core 400 has a tendency to move due to factors such as the battery falling or being impacted, the external force exerted by the battery core 400 on the first pole column 200 will be transmitted to the first side wall 120 and the second side wall 130, thereby reducing the external force received by a single side wall and reducing the risk of the outer shell 100 being deformed or damaged.

[0079] Similarly, referring to Figure 15 and Figure 16 , in some embodiments, the outer shell 100 further has a second clearance groove 122. The second clearance groove 122 faces the accommodation cavity 110. The second flange portion 320 is located within the second clearance groove 122. Further, the second flange portion 320 is connected to the inner wall of the second clearance groove 122. And since there is no need for insulation between the second pole column 300 and the outer shell 100, in some embodiments, the second flange portion 320 is directly welded to the outer shell 100 to form an integral structure with the outer shell 100, thereby further improving the strength of the battery. Further, in some embodiments, the radial side surface of the second flange portion 320 is welded to the radial side surface of the second clearance groove 122. Based on this, even if the position of the bottom wall of the outer shell 100 corresponding to the second clearance groove 122 is cracked during use, the accommodation cavity 110 can be sealed through the second flange portion 320 to prevent the battery from leaking liquid.

[0080] Since welding can have a higher connection strength, in some embodiments, the second clearance groove 122 penetrates the first side wall 120, and the radial side surface of the second flange portion 320 is welded to the outer shell 100. Thus, the welding process between the second flange portion 320 and the outer shell 100 can be made simpler, and the second flange portion 320 welded to the outer shell 100 can replace the part removed from the outer shell 100 at the second clearance groove 122, so that the battery has sufficient strength. Further, in some embodiments, in the first direction, the size of the second flange portion 320 is equal to the size of the first side wall 120. Thus, when the second flange portion 320 is located in the second clearance groove 122, the surface of the second flange portion 320 in the first direction is flush with the surface of the first side wall 120.

[0081] Referring to Figure 13 and Figure 14 , Figure 13 is a cross-sectional view of the hard-shell battery according to the seventh embodiment of the present invention. Figure 14 is Figure 13 an enlarged view of region E in . In some implementations, in the first direction, the outer shell 100 has a first side wall 120 and a second side wall 130 that are oppositely arranged. The first side wall 120 has a first clearance groove 121, and the first clearance groove 121 penetrates the first side wall 120. The first pole column 200 further includes a first connection portion 230. The first main body portion 210 has a second mounting hole 211 that penetrates in the first direction. The first connection portion 230 is inserted through the second mounting hole 211 and forms a riveting structure together with the first main body portion 210, so that the first pole column 200 is fixed to the outer shell 100. That is, the first connection portion 230 is inserted through the second mounting hole 211, passes through the first side wall 120 and the second side wall 130, and the two ends of the first connection portion 230 are deformed radially by means such as strong pressing to form a first locking portion 231 and a second locking portion 232 that respectively clamp the first side wall 120 and the second side wall 130, so that the first pole column 200 is fixed to the outer shell 100 to improve the connection strength between the first pole column 200 and the outer shell 100. It should be noted that when the first connection portion 230 is an insulating structure, the first locking portion 231 and the second locking portion 232 can directly abut against the outer shell 100. When the first connection portion 230 is a conductive structure, insulating members 500 are provided between the first locking portion 231 and the second locking portion 232 and the outer shell 100.

[0082] Similarly, referring to Figure 15 and Figure 16, in some embodiments, in a first direction, the housing 100 has a first side wall 120 and a second side wall 130 that are oppositely arranged. The first side wall 120 has a first clearance groove 121, and the first clearance groove 121 penetrates through the first side wall 120. The second pole 300 further includes a second connecting portion 330. The second main body portion 310 has a fourth mounting hole 311 that penetrates along the first direction. The second connecting portion 330 is inserted into the fourth mounting hole 311 and forms a riveting structure with the second main body portion 310 to fix the second pole 300 to the housing 100. It can be understood that in this embodiment, whether the second connecting portion 330 is an insulating structure or a conductive structure, the first locking portion 231 and the second locking portion 232 can directly abut against the housing 100, and the connection between the second pole 300 and the housing 100 is achieved through the riveting structure, which has higher strength compared to the method using adhesive, and compared to the welding method, it can avoid the influence of false soldering and the high temperature during welding on the housing 100 and the internal battery cell 400, improving the performance of the battery in this embodiment.

[0083] Based on the above embodiments, in some embodiments, the outer surface of the first side wall 120 further includes a third clearance groove 123, and the first locking portion 231 is located in the third clearance groove 123, without occupying the external space of the housing 100, thereby improving the energy density of the battery in this embodiment. Similarly, in some embodiments, the outer surface of the first side wall 120 further includes a fourth clearance groove 124, and the third locking portion 331 is located in the fourth clearance groove 124.

[0084] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. Hard shell battery, characterized in that, include: A housing having a receiving cavity; A battery cell is located in the accommodating cavity, and the battery cell includes a first pole piece, a second pole piece, and an isolation film located between the first pole piece and the second pole piece; A first pole, insulated from the housing, the first pole passing through a side wall of the housing corresponding to the thickness direction of the first pole piece, and a surface of the first pole piece in its own thickness direction connected to the first pole; The second pole is connected to any side wall of the shell, and the surface of the second pole piece in the thickness direction is connected to the shell, or the second pole is penetrated through the side wall of the shell corresponding to the thickness direction of the second pole piece, and the surface of the second pole piece in the thickness direction is connected to the second pole.

2. The battery according to claim 1, characterized in that The first pole piece includes a plurality of first straight portions distributed in a first direction, and each of the first straight portions is electrically connected to each other. The second pole piece includes a plurality of second straight portions distributed in the first direction, and each of the second straight portions is electrically connected to each other. In the first direction, the first straight portions and the second straight portions are alternately distributed. Among the two outermost first straight portions of the plurality of first straight portions, the first straight portion closer to the first pole is connected to the first pole.

3. The hard shell battery according to claim 1, characterized in that: The first pole and / or the second pole are located outside the battery cell.

4. The hard case battery according to claim 2, characterized in that: The isolation film includes multiple layers of third straight portions distributed in the first direction, each layer of the third straight portions has a first connection hole, and each layer of the second straight portions has a second connection hole. In the first direction, the first connection holes of each two adjacent layers of the third straight portions and the second connection holes of the second straight portions located between two adjacent layers of the third straight portions at least partially overlap to form a first electrical connection hole, so that adjacent first straight portions are connected to each other through the first electrical connection hole.

5. The hard case battery according to claim 4, characterized in that: The first straight portion defines a first mounting hole located inside the battery core at a position corresponding to the first electrical connection hole, and a portion of the first pole is inserted into the first mounting hole.

6. The hard case battery according to claim 5, characterized in that: The first straight portion of each layer has a third connection hole at a position corresponding to the first electrical connection hole, and the third connection hole, the second connection hole and the first connection hole together form a first mounting hole that penetrates the battery cell along the first direction; The first pole comprises a first main body and a first flange, the first flange is connected to the first main body and protrudes from the radial side of the first main body, the first main body is inserted into the first mounting hole, the hole edges of the third connecting holes of the multiple layers of the first straight portions are bent toward the first flange, and are all connected to the side of the first flange in the first direction; Alternatively, the hole edge of each of the third connection holes further includes a first flange portion folded along the first direction, and the first flange portion is connected to the radial side surface of the first pole.

7. The hard case battery according to claim 6, characterized in that: The first pole comprises a first main body and a first flange, the first flange is connected to the first main body and protrudes from the radial side of the first main body, the first main body is inserted into the first mounting hole, the hole edges of the third connecting holes of the multiple layers of the first straight portions are bent toward the first flange, and are all connected to the side of the first flange in the first direction; The first flange portion is located inside the first mounting hole; or, The first flange portion is located outside the first mounting hole.

8. The hard case battery according to claim 7, characterized in that: The first flange portion is located outside the first mounting hole, the housing further has a first air avoidance groove, the first air avoidance groove faces the accommodating cavity, and the first flange portion is located in the first air avoidance groove.

9. The hard case battery according to claim 8, characterized in that: In the first direction, the housing has a first side wall, the first side wall has the first air avoidance groove, and the first air avoidance groove runs through the first side wall; The first pole also includes a first connecting portion. The first main body has a second mounting hole extending along the first direction. The first connecting portion is inserted into the second mounting hole and forms a riveting structure with the first main body to fix the first pole to the housing.

10. The hard case battery according to any one of claims 2 to 9, characterized in that: Each layer of the third straight portion also has a fourth connecting hole, and each layer of the first straight portion has a fifth connecting hole. In the first direction, the fourth connecting holes of the third straight portions of each two adjacent layers and the fifth connecting holes of the first straight portion located between the third straight portions of each two adjacent layers at least partially overlap to form a second electrical connecting hole, so that adjacent second straight portions are connected to each other through the second electrical connecting hole.

11. The hard case battery according to claim 10, characterized in that: The second straight portion defines a third mounting hole located inside the battery core at a position corresponding to the second electrical connection hole, and a portion of the second pole is inserted into the third mounting hole.

12. The hard case battery according to claim 11, characterized in that: The second straight portion of each layer has a sixth connection hole at a position corresponding to the second electrical connection hole, and the fourth connection hole, the fifth connection hole and the sixth connection hole together form a third mounting hole that penetrates the battery cell along the first direction; The second pole comprises a second main body and a second flange, the second flange is connected to the second main body and protrudes from the radial side of the second main body, the second main body is plugged into the third mounting hole, the hole edges of the fourth connecting holes of the plurality of second straight portions are bent toward the second flange and are all connected to the side of the second flange in the first direction; or, The hole edge of each of the fourth connecting holes further includes a second flange portion folded along the first direction, and the second flange portion is connected to the radial side surface of the first pole.

13. The hard case battery according to claim 12, characterized in that: The second pole comprises a second main body and a second flange, the second flange is connected to the second main body and protrudes from the radial side of the second main body, the second main body is inserted into the third mounting hole, and the hole edges of the fourth connecting holes of the multi-layer second straight portions are bent toward the second flange and are all connected to the side of the second flange in the first direction; The second flange portion is located inside the third mounting hole; or, The second flange portion is located outside the third mounting hole.

14. The hard case battery according to claim 13, characterized in that: The second flange portion is located outside the third mounting hole, the housing further has a second air avoidance groove, the second air avoidance groove faces the accommodating cavity, and the second flange portion is located in the second air avoidance groove.

15. The hard case battery according to claim 14, characterized in that: The second flange is welded to the inner wall of the second air-avoiding groove to form an integrated structure with the outer shell.

16. The hard case battery according to claim 15, characterized in that: The radial side surface of the second flange portion is seal-welded to the inner wall of the second air-avoiding groove.

17. The hard case battery according to claim 14, characterized in that: In the first direction, the housing has a first side wall, the first side wall has the second air-avoiding groove, and the second air-avoiding groove runs through the first side wall; The second pole also includes a second connecting portion. The second main body has a fourth mounting hole extending along the first direction. The second connecting portion is inserted into the fourth mounting hole and forms a riveted structure with the second main body to fix the second pole to the housing.

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